/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.engine.compaction;

import org.apache.iotdb.commons.utils.FileUtils;
import org.apache.iotdb.db.conf.IoTDBConfig;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.engine.compaction.log.TsFileIdentifier;
import org.junit.Assert;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.nio.file.Files;

import static org.apache.iotdb.db.engine.compaction.log.TsFileIdentifier.INFO_SEPARATOR;

public class TsFileIdentifierUT {

    @Test
    public void testGetInfoFromFilePath() {
        String firstPath =
                "sequence"
                        + File.separator
                        + "root.test.sg"
                        + File.separator
                        + "0"
                        + File.separator
                        + "0"
                        + File.separator
                        + "1-1-0-0.tsfile";
        TsFileIdentifier firstInfo = TsFileIdentifier.getFileIdentifierFromFilePath(firstPath);
        Assert.assertEquals(firstInfo.getFilename(), "1-1-0-0.tsfile");
        Assert.assertEquals(firstInfo.getLogicalStorageGroupName(), "root.test.sg");
        Assert.assertEquals(firstInfo.getTimePartitionId(), "0");
        Assert.assertEquals(firstInfo.getDataRegionId(), "0");
        Assert.assertTrue(firstInfo.isSequence());

        String secondPath =
                "unsequence"
                        + File.separator
                        + "root.test.sg"
                        + File.separator
                        + "0"
                        + File.separator
                        + "426"
                        + File.separator
                        + "999-3-24-12.tsfile";

        TsFileIdentifier secondInfo = TsFileIdentifier.getFileIdentifierFromFilePath(secondPath);
        Assert.assertEquals(secondInfo.getFilename(), "999-3-24-12.tsfile");
        Assert.assertEquals(secondInfo.getLogicalStorageGroupName(), "root.test.sg");
        Assert.assertEquals(secondInfo.getTimePartitionId(), "426");
        Assert.assertEquals(secondInfo.getDataRegionId(), "0");
        Assert.assertFalse(secondInfo.isSequence());

        String illegalPath =
                "root.test.sg"
                        + File.separator
                        + "0"
                        + File.separator
                        + "426"
                        + File.separator
                        + "999-3-24-12.tsfile";
        try {
            TsFileIdentifier.getFileIdentifierFromFilePath(illegalPath);
            Assert.fail();
        } catch (RuntimeException e) {

        }
    }

    @Test
    public void testGetInfoFromInfoString() {
        String[] firstInfoArray = new String[]{"sequence", "root.test.sg", "0", "0", "1-1-0-0.tsfile"};
        String firstInfoString = String.join(INFO_SEPARATOR, firstInfoArray);
        TsFileIdentifier firstInfo = TsFileIdentifier.getFileIdentifierFromInfoString(firstInfoString);
        Assert.assertEquals(firstInfo.getFilename(), "1-1-0-0.tsfile");
        Assert.assertEquals(firstInfo.getTimePartitionId(), "0");
        Assert.assertEquals(firstInfo.getDataRegionId(), "0");
        Assert.assertEquals(firstInfo.getLogicalStorageGroupName(), "root.test.sg");
        Assert.assertTrue(firstInfo.isSequence());

        String[] secondInfoArray =
                new String[]{"unsequence", "root.test.sg", "0", "425", "666-888-222-131.tsfile"};
        String secondInfoString = String.join(INFO_SEPARATOR, secondInfoArray);
        TsFileIdentifier secondInfo =
                TsFileIdentifier.getFileIdentifierFromInfoString(secondInfoString);
        Assert.assertEquals(secondInfo.getFilename(), "666-888-222-131.tsfile");
        Assert.assertEquals(secondInfo.getTimePartitionId(), "425");
        Assert.assertEquals(secondInfo.getDataRegionId(), "0");
        Assert.assertEquals(secondInfo.getLogicalStorageGroupName(), "root.test.sg");
        Assert.assertFalse(secondInfo.isSequence());

        String[] illegalInfoArray = new String[]{"unsequence", "0", "425", "666-888-222-131.tsfile"};
        String illegalInfoString = String.join(INFO_SEPARATOR, illegalInfoArray);

        try {
            TsFileIdentifier.getFileIdentifierFromInfoString(illegalInfoString);
            Assert.fail();
        } catch (RuntimeException e) {

        }
    }

    @Test
    public void testGetInfoFromFileFromSingleDir() throws IOException {
        String firstPath =
                "sequence"
                        + File.separator
                        + "root.test.sg"
                        + File.separator
                        + "0"
                        + File.separator
                        + "0"
                        + File.separator
                        + "100-10-5-1.tsfile";
        String[] dataDirs = IoTDBDescriptor.getInstance().getConfig().getDataDirs();
        File file = new File(dataDirs[0], firstPath);

        if (file.exists()) {
            Assert.assertTrue(file.delete());
        }

        try {
            TsFileIdentifier info = TsFileIdentifier.getFileIdentifierFromFilePath(firstPath);
            Assert.assertNull(info.getFileFromDataDirs());
            if (!file.getParentFile().exists()) {
                Assert.assertTrue(file.getParentFile().mkdirs());
            }
            Assert.assertTrue(file.createNewFile());
            Assert.assertTrue(Files.isSameFile(file.toPath(), info.getFileFromDataDirs().toPath()));
        } finally {
            file.delete();
        }
    }

    @Test
    public void testGetInfoFromFileFromMultiDirs() throws Exception {
        IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();
        String[] originDataDirs = config.getDataDirs();
        Class configClass = config.getClass();
        Field dataDirField = configClass.getDeclaredField("dataDirs");
        dataDirField.setAccessible(true);
        dataDirField.set(
                config,
                new String[]{"target" + File.separator + "data1", "target" + File.separator + "data2"});
        String filePath =
                "sequence"
                        + File.separator
                        + "root.test.sg"
                        + File.separator
                        + "0"
                        + File.separator
                        + "0"
                        + File.separator
                        + "100-10-5-1.tsfile";
        File testFile = new File("target" + File.separator + "data2", filePath);
        try {
            TsFileIdentifier info = TsFileIdentifier.getFileIdentifierFromFilePath(filePath);
            if (!testFile.getParentFile().exists()) {
                Assert.assertTrue(testFile.getParentFile().mkdirs());
            }
            if (testFile.exists()) {
                Assert.assertTrue(testFile.delete());
            }
            Assert.assertNull(info.getFileFromDataDirs());
            Assert.assertTrue(testFile.createNewFile());
            Assert.assertTrue(Files.isSameFile(testFile.toPath(), info.getFileFromDataDirs().toPath()));
        } finally {
            dataDirField.set(config, originDataDirs);
            Files.deleteIfExists(testFile.toPath());
            FileUtils.deleteDirectory(new File("target" + File.separator + "data2"));
        }
    }
}
